Control knob



FIG. 1 is a perspective view of a control knob showing the design in a first non-illuminated state;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is an opposite side elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a partial enlarged view according to the broken circle denoted in FIG. 1;

FIG. 9 is a second partial enlarged view according to the broken circle denoted in FIG. 1, showing the control knob in an illuminated state;

FIG. 10 is a front elevational of the control knob of FIGS. 1-8 showing the new design in an illuminated state; and,

FIG. 11 is a top view thereof.

The broken lines shown form no part of the claimed design. The stippled shading and the dashed lines radiating from FIGS. 9-11 represent an illuminated state of the control knob. The line shading on the control knob depicts surface contours, and not a specific material, surface treatment, or texture. 

CLAIM The ornamental design for a control knob, as shown and described. 